A high linearity chireix outphasing power amplifier using composite right/left-handed transmission lines

Negative Conductance Load Modulation RF Power Amplifier Cody NeslenThe number of mobile wireless devices on the market has increased substantially over the last decade. The frequency spectrum has become crowded due to the number of devices demanding radio traffic and new modulation schemes have been developed to accommodate the number of users. These new modulation schemes have caused very poor efficiencies in power amplifiers for wireless transmission systems due to high peakto-average power ratios (PAPR). This thesis first presents the issue with classical power amplifiers in modern modulation systems. A brief overview of current attempts to mitigate this issue is provided. A new RF power amplifier topology is then presented with supporting simulations.The presented amplifier topology utilizes the concept of negative conductance and load modulation. The amplifier operates in two stages, a low power stage and a high power stage. A negative conductance amplifier is utilized during peak power transmission to modulate the load presented to the input amplifier. This topology is shown to greatly improve the power added efficiency of power amplifiers in systems with high PAPR.

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A high linearity chireix outphasing power amplifier using composite right/left-handed transmission lines

Cited by 2 publications

References 10 publications

Design and electromagnetic Simulation of a 40 dBm Class-AB GaN power amplifier

Design and electromagnetic Simulation of a 40 dBm Class-AB GaN power amplifier

Negative Conductance Load Modulation RF Power Amplifier

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